Discount Water Filters and Air Filters at Discount Filter Store.com

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Under Sink Water Filter Replacement Cartridges

Don’t settle for a replacement under sink water filter cartridge that simply fits, find one designed and manufactured specifically for your under sink water filter system.

Discount Filter Store has one of the largest selections of undersink filter cartridges. With under sink filter cartridges available in over 15+ different filter medias, 8+ different sizes (5x2½ - 20x4½), and a wide variety of filter life’s ranging from 250 gallons to 50,000+ gallons, you’re guaranteed to find the under sink water filter system and/or replacement cartridges you need. Choose from hundreds of under sink water filter cartridges from some of the industry’s top brands including American Plumber, Crystal Quest, Pentek®, Culligan®, GE, Aqua-Pure®, Whirlpool®, and more.

36 Item(s)

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Set Descending Direction
  • Pentek QC10-CB1R Carbon Block Quick Change Filter
  • W5CIP American Plumber Undersink Filter Replacement Cartridge (2-Pack)
  • WGCHD American Plumber Undersink Water Filter Replacement Cartridge
  • EPM-10 Pentek Undersink Filter Replacement Cartridge

    EPM-10 Pentek Undersink Filter Replacement Cartridge

    $9.99
    MSRP: $10.57
    Save 5%
  • PENTEK-GAC-10

    PENTEK-GAC-10

    $13.89
    MSRP: $17.99
    Save 23%
  • PENTEK-GAC-20

    PENTEK-GAC-20

    $19.29
    MSRP: $23.56
    Save 18%
  • GAC-5 Pentek Replacement Filter Cartridge
  • PENTEK-GAC-BB

    PENTEK-GAC-BB

    $27.79
  • PENTEK-NCP-10

    PENTEK-NCP-10

    $10.69
    MSRP: $11.95
    Save 11%
  • PENTEK-P-250

    PENTEK-P-250

    $35.29
    MSRP: $41.99
    Save 16%
  • P-250A Pentek Undersink Filter Set
  • P5-478 Pentek Undersink Filter Replacement Cartridge

    P5-478 Pentek Undersink Filter Replacement Cartridge

    $6.99
    MSRP: $8.15
    Save 14%
  • PENTEK-PCC-1

    PENTEK-PCC-1

    $44.89
    MSRP: $53.23
    Save 16%
  • PD-5-934 Pentek Undersink Filter Replacement Cartridge

    PD-5-934 Pentek Undersink Filter Replacement Cartridge

    $9.99
    MSRP: $12.34
    Save 19%
  • QC10-CBRR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • PENTEK-QC10-EPR

    PENTEK-QC10-EPR

    $25.69
    MSRP: $27.70
    Save 7%
  • QC10-GACR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • QC10-TSGACR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • R30-478 Pentek Undersink Filter Replacement Cartridge

    R30-478 Pentek Undersink Filter Replacement Cartridge

    $8.99
    MSRP: $12.75
    Save 29%
  • TSGAC-10 Pentek Undersink Filter Replacement Cartridge

    TSGAC-10 Pentek Undersink Filter Replacement Cartridge

    $20.99
    MSRP: $24.60
    Save 15%
  • C1 Pentek Undersink Filter Replacement Cartridge

    Pentek C1 Undersink Water Filter Replacement Cartridge

    $12.99
    MSRP: $15.34
    Save 15%
  • PENTEK-C2

    PENTEK-C2

    $8.59
    MSRP: $8.84
    Save 3%
  • PENTEK-CBC-5

    PENTEK-CBC-5

    $10.69
    MSRP: $16.55
    Save 35%
  • CBR2-10 Pentek Undersink Filter Replacement Cartridge
  • PENTEK-CBR2-10R

    PENTEK-CBR2-10R

    $20.29
    MSRP: $21.95
    Save 8%
  • PENTEK-CC-10

    PENTEK-CC-10

    $15.99
  • PENTEK-CCBC-10

    PENTEK-CCBC-10

    $20.29
  • PENTEK-CRE-1

    PENTEK-CRE-1

    $25.69
    MSRP: $30.69
    Save 16%
  • PENTEK-ECP5-10

    PENTEK-ECP5-10

    $9.59
  • PENTEK-EP-5

    PENTEK-EP-5

    $7.49
  • P10-5 Tier1 Polypropylene Sediment Filter

    P10-5 Tier1 Polypropylene Sediment Filter

    $2.55
    MSRP: $5.74
    Save 56%
  • P1-5 Tier1 Sediment Filter Cartridge

    P1-5 Tier1 Sediment Filter Cartridge

    $2.05
    MSRP: $8.34
    Save 75%
  • PENTEK-CB1-10

    PENTEK-CB1-10

    $15.99
  • P-250 Pentek Comparable Under Sink Water Filter Set by Tier1
  • P-250A Pentek Comparable Under Sink Filter Set by Tier1

    P-250A Pentek Comparable Under Sink Filter Set by Tier1

    $24.99 MSRP: $41.99
    Save 40%
  • WHKF-DB1 Whirlpool Comparable Under Sink Water Filter by Tier1

36 Item(s)

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